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Research was conducted under Cornell University IACUC Protocol 2008\u2009\u2212\u20090106. Research animals were collected using fine-mesh dip nets, and, when necessary, humanely sacrificed using an overdose of MS-222, in accordance with the Cornell University IACUC-approved protocol related to this research. The Cornell University Institutional Care and Use Committee (IACUC) specifically approved this study. No endangered or protected species were used in this research. Fish collection and export was approved by Ministry of Agriculture, Land and Marine Resources, Republic of Trinidad and Tobago, conforming to their legislation. Ministry officials were made aware of field sampling and laboratory research methods prior to collection. Guppies collected at some of the Guanapo sites were made with permission of the landowner, Tunapuna\/Piarco Municipal Corporation. No further specific permission was required from field sites, which were made from public roadsides with specific permission of the Ministry of Agriculture, Land and Marine Resources, Republic of Trinidad and Tobago.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}],"article-number":"31923"}}